From 32f55d835b23830bf9295d038a1693ce9fd41b56 Mon Sep 17 00:00:00 2001 From: Kirti Wankhede Date: Thu, 17 Nov 2016 02:16:16 +0530 Subject: [PATCH] vfio: Common function to increment container_users This change rearrange functions to have common function to increment container_users Signed-off-by: Kirti Wankhede Signed-off-by: Neo Jia Reviewed-by: Jike Song Signed-off-by: Alex Williamson --- drivers/vfio/vfio.c | 34 +++++++++++++++++++++------------- 1 file changed, 21 insertions(+), 13 deletions(-) diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 23bc86c1d05d..2e83bdf007fe 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -1385,6 +1385,23 @@ static bool vfio_group_viable(struct vfio_group *group) group, vfio_dev_viable) == 0); } +static int vfio_group_add_container_user(struct vfio_group *group) +{ + if (!atomic_inc_not_zero(&group->container_users)) + return -EINVAL; + + if (group->noiommu) { + atomic_dec(&group->container_users); + return -EPERM; + } + if (!group->container->iommu_driver || !vfio_group_viable(group)) { + atomic_dec(&group->container_users); + return -EINVAL; + } + + return 0; +} + static const struct file_operations vfio_device_fops; static int vfio_group_get_device_fd(struct vfio_group *group, char *buf) @@ -1694,23 +1711,14 @@ static const struct file_operations vfio_device_fops = { struct vfio_group *vfio_group_get_external_user(struct file *filep) { struct vfio_group *group = filep->private_data; + int ret; if (filep->f_op != &vfio_group_fops) return ERR_PTR(-EINVAL); - if (!atomic_inc_not_zero(&group->container_users)) - return ERR_PTR(-EINVAL); - - if (group->noiommu) { - atomic_dec(&group->container_users); - return ERR_PTR(-EPERM); - } - - if (!group->container->iommu_driver || - !vfio_group_viable(group)) { - atomic_dec(&group->container_users); - return ERR_PTR(-EINVAL); - } + ret = vfio_group_add_container_user(group); + if (ret) + return ERR_PTR(ret); vfio_group_get(group); -- 2.39.5